FREQUENCY SHIFT MODULATOR WITH AMPLITUDE COMPENSATION

摘要

A frequency modulator apparatus receives pulse signals switching between two amplitudes. The pulse signals are fed, via a modulator means which transmits square wave signals switching between two frequencies, to an integrator means. The integrator means converts the square wave signals to triangular-shaped signals which are then converted to substantially sinusoidal signals. There is also included means for compensating for the frequency dependent changes in amplitude of the signals introduced by the integrator means.